Better spline fences?

Lay a length of fence with 3 spline points - start, middle, end. Break the spline at the middle point (making it 2 overlapping points). Move either the start point or the end point to a position that creates a 90 degree corner at the middle points.

The 90 degree angle is only judged by eye, but you may be able to use the ground grid in wireframe view or some prop like a rectangular building to help get it more exact.

If the fence has end caps, you will need to slide the corner points back until the ends of the fence meet where the corner should be.
 
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I lay a spline length down, then join another length to it and move this one along the grid line where the fence is going in the other direction. There will be a curve where the spline is joined so use the "Split spline" tool. The fence is now at 90%. Or as has been mentioned use the "Shift"key. Both ways are nice and simple.

 
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